<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ name: 'home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table class="tree-table" :data="cateList" :columns="columns" :selection-type="false" :expand-type="false" show-index border>
        <!-- 是否有效 -->
        <template slot="isOk" slot-scope="scope">
          <i class="el-icon-error" style="color: red" v-if="scope.row.cat_deleted"></i>
          <i class="el-icon-success" style="color: lightgreen" v-else></i>
        </template>
        <!-- 级别 -->
        <template slot="Order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level == 0">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="scope.row.cat_level == 1">二级</el-tag>
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="operate" slot-scope="scope">
          <el-button size="mini" type="primary" class="el-icon-edit" @click="showEditDialog(scope.row.cat_id)">编辑</el-button>
          <el-button size="mini" type="danger" class="el-icon-delete" @click="removeCateById(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类" :visible.sync="addDialogVisible" width="50%" @close="addDialogclosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <el-cascader v-model="selectedKeys" :options="parentCateList" :props="cascaderProps" @change="handleChange" clearable></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑分类对话框 -->
    <el-dialog title="编辑分类" :visible.sync="editDialogVisible" width="50%" @close="editDialogclosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //查询分类列表的参数对象
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      // 分类列表
      cateList: [],
      // 总条数
      total: 0,
      // 表格列
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          //模板列
          type: "template",
          // 使用模板列的名称
          template: "isOk",
        },
        {
          label: "级别",
          //模板列
          type: "template",
          // 使用模板列的名称
          template: "Order",
        },
        {
          label: "操作",
          //模板列
          type: "template",
          // 使用模板列的名称
          template: "operate",
        },
      ],
      addDialogVisible: false,
      addForm: {
        cat_name: "", //名称
        cat_pid: 0, //父级分类id
        cat_level: 0, //父级分类等级
      },
      addFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
          { min: 3, max: 5, message: "长度在 3 到 5 个字符", trigger: "blur" },
        ],
      },
      // 父级分类列表
      parentCateList: [],
      //级别选择器的配置对象
      cascaderProps: {
        label: "cat_name",
        value: "cat_id",
        children: "children",
        expandTrigger: "hover",
        checkStrictly: true,
      },
      //级别选择器选中的id数组
      selectedKeys: [],
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
          { min: 3, max: 5, message: "长度在 3 到 5 个字符", trigger: "blur" },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo,
      });
      if (res.meta.status != 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.cateList = res.data.result;
      this.total = res.data.total;
    },
    handleSizeChange(pagesize) {
      this.queryInfo.pagesize = pagesize;
      this.getCateList();
    },
    handleCurrentChange(pagenum) {
      this.queryInfo.pagenum = pagenum;
      this.getCateList();
    },
    // 获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", { params: { type: 2 } });
      if (res.meta.status != 200) {
        return this.$message.error("获取父级分类列表失败");
      }
      this.parentCateList = res.data;
    },
    showAddDialog() {
      this.getParentCateList();
      this.addDialogVisible = true;
    },
    //监听级别选择器的改变
    handleChange() {
      // 判断是否选择父级分类
      if (this.selectedKeys.length > 0) {
        this.addForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1];
        this.addForm.cat_level = this.selectedKeys.length;
      } else {
        this.addForm.cat_pid = 0;
        this.addForm.cat_level = 0;
      }
    },
    //添加分类
    addCate() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return;
        }
        const { data: res } = await this.$http.post("categories", this.addForm);
        if (res.meta.status != 201) {
          return this.$message.error("添加分类失败");
        }
        this.addDialogVisible = false;
        this.getCateList();
        this.$message.success("添加分类成功");
      });
    },
    //监听添加分类对话框关闭
    addDialogclosed() {
      this.$refs.addFormRef.resetFields();
      this.selectedKeys = [];
      this.addForm.cat_pid = 0;
      this.addForm.cat_level = 0;
    },
    //编辑分类对话框关闭
    editDialogclosed() {
      this.$refs.editFormRef.resetFields();
    },
    //编辑分类对话框显示
    async showEditDialog(cateId) {
      const { data: res } = await this.$http.get(`categories/${cateId}`);
      if (res.meta.status != 200) {
        return this.$message.error("查询分类失败");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    //编辑分类的确定
    editCate() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) {
          return;
        }
        const { data: res } = await this.$http.put(`categories/${this.editForm.cat_id}`, {
          cat_name: this.editForm.cat_name,
        });
        if (res.meta.status != 200) {
          return this.$message.error("修改分类失败");
        }
        this.editDialogVisible = false;
        this.getCateList();
        this.$message.success("修改分类成功");
      });
    },
    removeCateById(catId) {
      this.$confirm("确定要删除该分类嘛?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(async () => {
          const { data: res } = await this.$http.delete(`categories/${catId}`);
          if (res.meta.status != 200) {
            return this.$message.error("删除分类失败");
          }
          this.getCateList();
          this.$message.success("删除分类成功");
        })
        .catch(() => {
          this.$message.info("已取消删除");
        });
    },
  },
};
</script>

<style lang="less" scoped>
.el-cascader {
  width: 100%;
}
.tree-table {
  margin-top: 15px;
}
</style>
